Mitsubishi Electronics QD75P, QD75D Absolute position signal transmission procedure, Dedicated

Models: QD75P QD75D

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12 CONTROL SUB FUNCTIONS

MELSEC-Q

[3]Absolute position signal transmission procedure

(1)Figure 12.34 shows the outline of the absolute position signal transmission procedure between the servo amplifier and the PLC system (PLC CPU, QD75, I/O module).

Refer to the operation manual of the servo amplifier for details on the communication between the servo amplifier and the PLC system.

(2)Errors during communication

(a)If the system expires during communication, an error "ABS transmission timeout" (error code: 213) will occur.

(b)If the transmission data causes a sum error, an error "ABS transmission

SUM" (error code: 214) will occur.

Refer to Section 15.2 "List of errors" for the remedial method to be taken when an error occurs.

Servo amplifier

 

I/O module

PLC CPU

QD75

 

 

Servo ON signal

 

 

<Absolute position detection request>

ABS transmission

 

 

 

 

[Dedicated

 

 

 

mode

 

 

 

ABS request

instruction]

<Current position data>

 

 

 

ABRST1

Md.20

 

 

 

ABRST2

Current feed value

 

 

 

Md.21

 

 

 

 

 

 

Transmission data

ABRST3

Machine feed value

Current position

Data transmission

preparation completed

ABRST4

 

 

 

ABS bit0

 

 

data

 

 

 

 

 

 

 

 

 

ABS bit1

 

 

Fig. 12.34 Absolute position signal transmission procedure

Refer to Chapter 14 "Dedicated instructions" for details of the dedicated instructions.

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Mitsubishi Electronics QD75P, QD75D user manual Absolute position signal transmission procedure, Dedicated, Instruction